<p>Hey y'all.</p>
<p>I plan to self study for the AP psychology exam this May. I've been told Barron's is all you need, so I went to my local library to find it. They only have the 3rd edition (from 2008 I think). Is there anything drastically different between the 3rd and the current 5th edition? Should I just buy the 5th edition?</p>